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Firefox does not respect KDE theming
(lemm.ee)
I think Firefox uses GTK theming.
it absolutely does. OP need to add Breeze to GTK Application Styles.
It is already set to breeze unfortunately...
EDIT: The GTK theme was set to breeze. I set it to default, applied, then back to breeze, applied... and it is fixed...
i dont know if its my setup, but FF on KDE has been acting weird as of late. Popout videos dont stay on top windows, popout extensions dont act like additional windows. becoming annoying
Firefox uses GTK themes
All about Fedora Linux